"""飞船"""
import pygame
from pygame.sprite import Sprite

class Ship(Sprite):
    def __init__(self, screen, gui_settings):
        super().__init__()
        """初始化飞船，并设置其位置"""
        self.screen = screen
        self.settings = gui_settings
        # 加载飞船图像并获取其外接矩形
        self.image = pygame.image.load('./images/ship.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()

        # 将每艘飞船放在屏幕中间
        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom

        # 飞船的属性centor中存储小数值
        self.center = float(self.rect.centerx)

        # 移动标志
        self.moving_right = False
        self.moving_left = False

    def blitme(self):
        """在指定位置绘制飞船"""
        self.screen.blit(self.image, self.rect)

    def updateMoving(self):
        """根据移动标志调整飞船的位置"""
        if self.moving_right and self.rect.right < self.screen_rect.right:
            self.center += self.settings.ship_speed_factor
        if self.moving_left and self.rect.left >0:
            self.center -= self.settings.ship_speed_factor

        #更新rect对象
        self.rect.centerx=self.center

    def center_ship(self):
        """让飞船居中"""
        self.center = self.screen_rect.centerx